Metal-Insulator Transition in the Hubbard Model on a Triangular Lattice

Jayaprakash, C and Krishnamurthy, HR and Sarker, S and Wenzel, W (1991) Metal-Insulator Transition in the Hubbard Model on a Triangular Lattice. In: EPL: Europhysics Letters, 15 (6). pp. 625-630.

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Abstract

We discuss the results of an extensive mean-field investigation of the half-filled Hubbard model on a triangular lattice at zero temperature. At intermediate U we find a first-order metal-insulator transition from an incommensurate spiral magnetic metal to a semiconducting state with a commensurate linear spin density wave ordering stabilized by the competition between the kinetic energy and the frustrated nature of the magnetic interaction. At large U the ground state is that of a classical triangular antiferromagnet within our approximation. In the incommensurate spiral metallic phase the Fermi surface has parts in which the wave function renormalization Z is extremely small. The evolution of the Fermi surface and the broadening of the quasi-particle band along with the variation of the plasma frequency and a charge stiffness constant with U/t are discussed.

Item Type:	Journal Article
Publication:	EPL: Europhysics Letters
Publisher:	EDP Sciences
Additional Information:	Copyright of this article belongs to EDP Sciences.
Keywords:	Metal-Insulator Transitions;General Theory And Models Of Magnetic Ordering.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	23 Nov 2010 09:52
Last Modified:	23 Nov 2010 09:52
URI:	http://eprints.iisc.ac.in/id/eprint/33983

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